Did you ever think about how different our lives would be without wheels? No rollerblades. No bicycles. No skateboards!

Leonardo da Vinci didn't invent wheels, but you'd be amazed at the things he did invent--or think about--more than 500 years ago.

For a look at the life of a man who made many
remarkable scientific discoveries:

Here's a list of books with more information about inventors
and their inventions:

Mistakes that Worked, by Charlotte Foltz Jones,
Bantam/Doubleday/Dell, 1991

The Inventors: Nobel Prizes in Chemistry, Physics, and Medicine,
by Nathan Aaseng, Lerner Publications, 1988